<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>

  <body>
    <script>
        const arr = [{
          name: '张三',
          salary: 10000
        }, {
          name: '李四',
          salary: 10000
        }, {
          name: '王五',
          salary: 20000
        },
        ]
      const res= arr.reduce((prve,item)=>prve+item.salary*2,0)

      console.log(res);
    </script>
  </body>
</html>
